Nut-lock.



WIT 'EssEs W. MACDONALD.

NUT LOCK.

APPLICATION FILED MAR. 26. 1914.

Patented Aug. 3, 1915.

ps. AM

IN VENTOR 1: IA PLANoaBAI' WILLIAM MACDONALD, OF SANDFORD DENE,SASKATCHEWAN, CANADA.

NUT-LOCK.

Specification-of Letters Patent.

Patented Aug. 3, 1915.

Application filed March 26, 1914. Serial No. 827,489.

To all whom it may concern:

Be it known that I, WILLIAM MACDONALD, of the post-office of SandfordDene, in the Province of Saskatchewan, Canada, have invented certain newand useful Improvements in Nut-Locks, of which the following is thespecification. v

The invention relates to improvements in nut locks and the object of theinvention is to provide an inexpensive efiicient nut lock which isconstructed so that the nut can be readily screwed down on the bolt butwill look when unscrewed and thereby prevent the removal of the nut fromthe bolt.

lVith the above object in view the invention consists essentially in abolt having 1ongitudinally directed grooves in the periphery thereof, anut threaded on the bolt and a spring catch carried by the nut anddesigned to pass into the grooves in the turning of the nut on the bolt,the parts being arranged and constructed as hereinafter moreparticularly described and later pointed out in the appended claim.

Figure 1 represents a side view of my invention. Fig. 2 represents aside view of the nut lock in a position turned a quarter turn from theposition shown in Fig. 1. Fig. 3 represents a plan view.

In the drawing like characters of reference indicate corresponding partsin each figure. 4

1 represents a screw threaded bolt provided in the present instance withfour longitudinally directed channels 2, 3, 4: and 5, these being cutapproximately a depth equal to the thread of the bolt.

6 represents a nut screw threaded on the bolt in the usual way.

7 represents a spring catch carried by the nut, the catch beingcontained in a more or less L-shaped slot 7 formed in the nut and havingthe outer end thereof fastened per- Oopies of this patent may beobtained for manently to the body of the nut in any suitable way and theinner end bearing on the threads of the bolt. In the present instancethe catch has been secured to the nut by cutting the nut to receive theouter end of the catch and by turning and jamming the upper end of thelip 8 so provided over the body of the catch.

With this form of lock it will be seen that as the nut is turned in aright hand direction on the bolt the catch will ride over the threadsand into and out of the grooves. However if one attempts to unscrew thenut the catch will spring into the presented grooves and prevent thefurther movement of the nut.

It will be seen that if it is desired to unscrew the nut one has simplyto spring back the catch and hold it away from the threads. The catchcan be readily approached from the top of the nut as the slot is openfrom the top.

What I claim as my invention is:

The combination with a bolt provided with a longitudinal groove passingacross the threads thereof, of a nut threaded onto said bolt, an Lshaped slot formed in said nut, a lip formed by said slot, a springcatch contained within said slot, said lip being jammed upon one end ofthe body of the catch, the other end thereof being adapted to trip intoand escape from said groove in the screwing down of the nut and to passinto and remain in said groove in an attempt to unscrew the nut as andfor the purpose described.

Signed at Winnipeg, this 10th day of March, 1914.

WILLIAM MACDONALD.

In the presence "of' G. S. ROXBURGH, L. GOULD.

five cents each, by addressing the Commissioner of Patents, Washington,D. C.

